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In situ hybridization and immunocytochemistry in serial sections of rabbit skeletal muscle to detect myosin expression

DJ Dix and BR Eisenberg

Department of Physiology, Rush Medical College, Chicago, Illinois 60612- 3864.

We performed in situ hybridization of myosin heavy-chain (MHC) mRNA on rabbit muscle using a biotin-labeled complementary RNA probe. An 1107- nucleotide fragment from an alpha-cardiac MHC cDNA was used to transcribe an RNA probe 97% similar to slow-twitch and 75% similar to fast-twitch sequences. Serial sections were used to identify slow- twitch fibers in medial gastrocnemius, soleus, and tibialis anterior by immunofluorescence of slow MHC and oxidative capacity by histochemistry. Slow-twitch fibers hybridized by the RNA probe stained heavily after detection with streptavidin-alkaline phosphatase (89% dark and 11% medium density). Fast-oxidative fibers stained intermediately (26% dark, 58% medium, and 16% light) and fast- glycolytic fibers stained lightly (12% medium and 88% light). Biotin- labeled probe and enzymatic detection allowed greater resolution of the subcellular location of the MHC mRNA, a distinct advantage over isotope labeling and autoradiography. A non-uniform distribution of MHC mRNA was recognized within an adult skeletal muscle fiber. High concentrations of MHC mRNA were found under the sarcolemma and between the myofibrils, suggesting the existence of a distribution mechanism. The combination of in situ hybridization and immunocytochemistry allows rapid subcellular localization of both MHC mRNA and its translated protein.

Volume 36, Issue 12, pp. 1519-1526, 12/01/1988
Copyright © 1988 by The Histochemical Society


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